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Using solar spectral irradiance measurements from the SORCE spacecraft andthe F/F' technique, we have estimated the radial velocity (RV) scatter inducedon the Sun by stellar activity as a function of wavelength. Our goal was toevaluate the potential advantages of using new near-infrared (NIR)spectrographs to search for low-mass planets around bright F, G, and K stars bybeating down activity effects. Unlike M dwarfs, which have higher fluxes andtherefore greater RV information content in the NIR, solar-type stars arebrightest at visible wavelengths, and, based solely on information content, arebetter suited to traditional optical RV surveys. However, we find that the F/F'estimated RV noise induced by stellar activity is diminished by up to a factorof 4 in the NIR versus the visible. Observations with the upcoming futuregeneration of NIR instruments can be a valuable addition to the search forlow-mass planets around bright FGK stars in reducing the amount of stellarnoise affecting RV measurements.

Towards Understanding Stellar Radial Velocity Jitter as a Function of Wavelength: The Sun as a Proxy